periodic table Flashcards
1
Q
alkali metals
A
found in 1 group, reactive
2
Q
familes
A
metals, non-metals, metalloids
3
Q
john newlands
A
by physical characteristicis, atomic #
4
Q
dimitri mendeleev
A
by atomic mass, left space,invented it
5
Q
henry mosley
A
atomic # = # of protons in nucleus, created the 1 we use now
6
Q
horizontal rows
A
called periods
7
Q
verticals columns
A
called groups, same groups= same properties
8
Q
lanthanides
A
naturally found on earth, 7
9
Q
actinides
A
all radioactive
10
Q
metalloids
A
4
11
Q
alkaline- earth metals
A
group 2, less reactive
12
Q
Transition metals
A
group 3
13
Q
non-metals
A
poor conductors,lack most properties of mental
14
Q
halogens
A
group 5, have 7 valence electrons
15
Q
noble gases
A
6
